E. G. Alirzayeva, T. S. Shiryan, M. A. Yazici, S. M. Alverdiyeva and V. M. Cakmale, “Heavy Metal Accumulation in Artemisia and Foliaceous Lichen Species From The Azerbaijan Flora,” Forest Snow And Landscape Research, Vol. 80, No. 3, 2006, pp. 339-348.
 S. Bakidere and M. Yaman, “Determination of Lead, Cadmium, Copper in Roadside Soil and Plants in Elazig, Turkey,” Environmental Monitoring and Assessment, Vol. 136, No. 1-3, 2008, pp. 401-410. doi:10.1007/s10661-007-9695-1
 R. Vinodhini and M. Narayanan, “Bioaccumulation of Heavy Metals in Organs of Fresh Fish Cyprinus carpio (common carp),” International Journal of Environmental Science and Technology, Vol. 5, No. 2, 2008, pp. 179-182.
 T. T. Emmanuel and G. O. Tonye, “Macro and Trace Element Accumulation in Edible Crabs and Frogs in Alaro Stream Ecosystem, Ibadan, Nigeria,” Journal of Research in National Development, Vol. 9, No. 2, 2011, pp. 1596-8308.
 M. Canbek, T. A. Demir, M. Uyanoglu, G. Bayramoglu, O. Emroglu, N. Arslan and O. Koyuncu, “Preliminary Assessment of Heavy Metals in Water and Some Cyprinidae Species from Porsuk River, Turkey,” Journal of Applied Biological Sciences, Vol. 1, No. 3, 2007, pp. 89-93.
 M. A. I. Chukwujindu, E. N. Godwin and O. A. Francis, “Assessment of contamination by heavy metals in Sediments of Ase River, Niger Delta, Nigeria,” Research Journal of Environmental Sciences, Vol. 1, 2007, pp. 220-228.
 J. C. Akan, F. I. Abdulrahman, O. A. Sadipo and Y. A. Chiroma, “Distribution of Heavy metals in the Liver, Kidney and Meat of Beef, Mutton, Caprine and Chicken from Rasuwan Shanu Market in Maiduguri Metropolis, Borno State, Nigeria,” Research Journal of Applied Sciences, Engineering and Technology, Vol. 2, No. 8, 2010, pp. 743-748.
 E. S. Ilona, S. T. Anush and P. P. Yurv, “Effect of Molybdenium, Chrome and Cadmium Ions on Metamorphosis and Erythrocytes Morphology of the Marsh Frog pelophylax ridibundus (Amphibia: Anura),” Journal of Environmental Science and Technology, Vol. 4, No. 2, 2011, pp. 172-181. doi:10.3923/jest.2011.172.181
 S. Luo, M. C. Plowman, S. M. Hopfer and F. W. Sunderman Jr., “Mg2+ deprivation enhances and Mg2+ supplementation diminishes the embryo toxic and teratogenic effects of Ni2+, Co2+, Cd2+ for frog embryos in the FETAX Assay,” Annals of clinical and laboratory science, Vol. 23, No. 2, 1993, pp. 121-129.
 I. S. Eneji, “Spatial and Temporal Variation in the Heavy Metals Loading of River Benue in Makurdi Metropolitan Area,” PhD Thesis, Department of Chemistry, University of Agriculture, Makurdi, 2010, pp. 1-234.
 I. S. Eneji, R. Sha’Ato and P. A. Annune, “Bioaccumulation of Heavy Metals in Fish (Tilapia zilli and Clarias gariepinus) Organs from River Benue, North-Central Nigeria,” Pakistan Journal of Analytical and Environmental Chemistry, Vol. 12, No. 1-2, 2011, pp. 25-31. doi:10.1021/ac50057a034
 J. E. Poldoski, “Determination of Lead and Cadmium in Fish and Clam Tissue by Atomic Absorption Spectrometry with a Molybdenum and Lanthanum Treated Pyrolytic Graphite Atomizer,” Analytical Chemistry, Vol. 52, No. 7, 1980, pp. 1147-1151.
 I. A. Ololade, L. Lajide, I. A. Amoo and N. A. Oladoja, “Investigation of Heavy Metalcontamination of Edible Marine Seafood,” Africa Journal of Pure and Applied Chemistry, Vol. 2, No. 12, 2011, pp. 121-131.